






$449,000 - 342 Mary Street, Oshawa
Detached for Sale in Oshawa
New — Listed todayNeighbourhood: O'Neill
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- MLS Number
- E14107444
- Property Type
- Detached
- Status
- active
- Days on Site
- 0
- Bedrooms
- 2
- Bathrooms
- 2
- Square Feet
- 3,000 - 3,499 sqft
- Neighbourhood
- Oshawa
- Taxes (2026)
- $6,585
- Listing Brokerage
- Keller Williams Energy Real Estate
Attention contractors, builders, and savvy investors! This detached two-storey home offers over 3,000 sq. ft. of space and endless potential for those looking to renovate, reimagine, or explore future development possibilities. Situated on a great-sized lot in the established community of O'Neil, this property is zoned R5-A, with potential for a fourplex development, subject to buyer due diligence and all applicable municipal approvals. Conveniently located close to schools, community centres, everyday amenities, and more, this is an exciting opportunity to unlock the full potential of a property in a desirable Oshawa location. Property is being sold AS IS, WHERE IS. Bring your vision, creativity, and plans to make the most of this unique opportunity!
Estimate your monthly payments for this property
Estimated Payment
$2,303.60/mo
Includes CMHC insurance ($12,527)
5-yr fixed avg.
Rates shown are estimates based on typical Ontario 5-year fixed rates. Canadian mortgages use semi-annual compounding as required by law. CMHC insurance applies to purchases under $1.5M with less than 20% down. Estimated property tax uses an approximate 0.85% rate. Contact us for current rate options and pre-approval.
Discover O'Neill
O'Neill is a vibrant community in the Greater Toronto Area, offering excellent amenities, schools, and transportation options. This area is popular with families and professionals seeking a balanced lifestyle with access to urban conveniences and natural spaces.
Why Live in O'Neill
- •Convenient location in Oshawa
- •Access to local shops and dining
- •Good public transit connections
- •Community parks and green spaces
- •Well-maintained neighbourhoods
Nearby Schools
Transit & Commuting
- •MiWay bus routes throughout the area
- •GO Transit stations within driving distance
- •Easy highway access to 401/403/QEW
- •Walking distance to local amenities
Parks & Amenities
- •Local parks and recreational facilities
- •Community centres
- •Shopping plazas nearby
- •Restaurants and cafes
Lifestyle & Community
O'Neill offers a wonderful quality of life with a mix of residential charm and urban convenience. Residents enjoy easy access to schools, parks, and shopping, making it an ideal location for families and professionals alike.
342 Mary Street, Oshawa
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Monthly Cash Flow Breakdown
Note: These are estimates only. Actual figures may vary based on market conditions, property condition, and other factors. Consult with a financial advisor for personalized advice.

Joe's Thoughts
Honest perspective from 30+ years of GTA real estate experience
Competitive Pricing
At $150/sqft, this is priced below the area average. This could represent genuine value, but let's investigate why. In my experience, underpriced homes often have deferred maintenance, unfavourable layouts, or motivated sellers. I'll help you determine which it is.
Just Listed - Act Strategically
This property hit the market within the last week. In Oshawa's current market, desirable homes often receive multiple offers within 5-7 days. If you're seriously interested, I recommend booking a showing immediately. However, never let urgency override due diligence - we'll still do proper inspections.
Detached Home Advantages
Detached homes in Oshawa are increasingly scarce and valuable. You'll have no shared walls, full control over renovations, and typically stronger appreciation. Consider the lot size and potential for future additions or basement apartment income. Detached homes also offer the most flexibility for growing families.
Larger Home Realities
At 3,000 sqft, this is a substantial home. Budget approximately $400-600/month more for utilities compared to an average-sized home. Maintenance costs scale with size too - roof, HVAC, and cleaning all cost more. That said, space is a luxury that's hard to add later, and larger homes often have better resale in family-oriented neighbourhoods.
About O'Neill
I know O'Neill well from working with many buyers and sellers here. Each pocket has its own character - let me share what I've learned about this specific street and block. During our showing, I'll point out local amenities, school catchments, and what similar homes have sold for recently.
Let's See It Together
Photos only tell part of the story. During our showing, I'll point out things the camera doesn't capture: neighbourhood feel, natural light quality, traffic noise, and overall condition. I'll also share what comparable homes have sold for and help you craft a winning strategy if you decide to move forward.